Rimpy,
I think you're referring to the Products in Product Control, not the Products in the Sales Window, right?
As far as I know, they will only appear in ascending order by item number within Product Control. However, you can export them (within Product Control) as a .txt file - under "File", then by either "Export Products" (which will included ALL the details on ALL products) or "Export Products in List" (which is a somewhat abbreviated version, just showing the products that you're looking at).
From there, you can open the .txt file with Excel, for instance - as a .csv or .xls file. Once in spreadsheet form, you can put them in any order you want, by whichever column you want. As long as do the sorting in Excel correctly, you can do whatever editing you want, then Import the file back into EZP. It actually works pretty nicely, once you figure out the steps (and are careful).
I tried for the longest time myself to coordinate the names of Products with the Item #'s, so I could keep some semblance of organization alphabetically. Before long, though, I had to let go of that, and settled with doing it the above way if I felt I needed to see the list in alpha order badly enough.
Hope that helps.